أسئله في الأحصااء
السسلامـ عليكمـ ورحمة الله وبركاتهـ
عندي كم سؤال أحتاج حله ,,
1- find the z value to the left of the mean so that 98.87%of the area under the distribution curve lies to the right of it >
2- find two zvalues so that 48%of the middle area is bounded by them .
3- a mandatory competency test for high school sophomores has a normal distribution with a mean of 400 and a standard deviation of 100
a_ the top 3% of students receive 500$.what is the minimum score you would need to receive this a ward ?
b_ the bottom 1.5% students must go to summer .what is the minimum score you would need to stay out of this group ?
وبس اتمنى حلهااا :)
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